TY - JOUR
T1 - Discussion and comments on the paper
T2 - electron-optical studies of phyllosilicate intergrowths in sedimentary and metamorphic rocks.
AU - Morad, S.
AU - Aldahan, A. A.
PY - 1986
Y1 - 1986
N2 - The authors agree with the conclusion of White et al. (M.A. 85M/3533) that the origin of chlorite-illite (phengite) intergrowths is mainly by diagenetic and low-grade metamorphic alteration of detrital biotite. They dispute, however, that biotite changes to chlorite via an intermediate K-depleted biotite and suggest that the main change in composition of biotite by chloritization is the decrease in K content. They also prefer a net transformation reaction: 1 fresh biotite + 3.4H+ + 0.8H2O = 0.4 chlorite + 0.4 illite + 1.3K+ + 0.2H2SiO4 + 0.6Mg2+ + 0.4Fe2+.-R.A.H.
AB - The authors agree with the conclusion of White et al. (M.A. 85M/3533) that the origin of chlorite-illite (phengite) intergrowths is mainly by diagenetic and low-grade metamorphic alteration of detrital biotite. They dispute, however, that biotite changes to chlorite via an intermediate K-depleted biotite and suggest that the main change in composition of biotite by chloritization is the decrease in K content. They also prefer a net transformation reaction: 1 fresh biotite + 3.4H+ + 0.8H2O = 0.4 chlorite + 0.4 illite + 1.3K+ + 0.2H2SiO4 + 0.6Mg2+ + 0.4Fe2+.-R.A.H.
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U2 - 10.1180/minmag.1986.050.356.26
DO - 10.1180/minmag.1986.050.356.26
M3 - Article
AN - SCOPUS:0022506371
SN - 0026-461X
VL - 50
SP - 340
EP - 343
JO - Mineralogical Magazine
JF - Mineralogical Magazine
IS - 2
ER -